#include <stdio.h>
int main ()
{
	int iMonth = 0 ,iDay = 0;
	printf("enter the month you want to know the days\n");
	scanf("%d",&iMonth);
	switch(iMonth)
	{
		case 1:
		case 3:
	    case 5:
	    case 7:
	    case 8:
	    case 10:
	    case 12:
	    	iDay = 31 ;
			break;
		case 4:
		case 6:
		case 9:
		case 11:
			iDay = 30 ;
			break;
		case 2:
			iDay = 28 ;
			break;
		default :
		iDay = -1 ;
		break ;
		
	}
	if (iDay == -1)
	{
		printf("there is a error with you enter \n");
		
	}
	else 
	{
		printf("2020.%d has %d days \n",iMonth , iDay);
		
		}
		return 0;
		
}
